software-engineering-lab5/oral_calculation.cpp at main · nullpointers-FZU/software-engineering-lab5 · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
#include <iostream>
#include <algorithm>
#include <string>
#include <iomanip>
#include <math.h>
#include <limits.h>
#include <stdlib.h>
#include <set>
using namespace std;

int extractGrade(string &grade)
{
    string str1=grade.substr(grade.length()-1);
    int gradenum = stoi(str1);
    return gradenum;
}

double generateEquation(int grade)
{
    double ans = 0;
    int num1;
    int num2;
    int random_operation_index;
    string opChar[4] = {"+", "-", "*", "/"};
    if (grade == 1 || grade == 2)
    {
        num1 = rand() % 100 + 1;
        num2 = rand() % 100 + 1;

        random_operation_index = (rand() % 2);
        switch (random_operation_index)
        {
        case 0:
            printf("%d + %d = ?\n", num1, num2);
            ans = num1 + num2;
            break;
        case 1:
            printf("%d - %d = ?\n", num1, num2);
            ans = num1 - num2;
            break;
        }
    }
    else if (grade == 3 || grade == 4)
    {
        num1 = rand();
        num2 = rand();
        random_operation_index = (rand() % 4);
        switch (random_operation_index)
        {
        case 0:
            printf("%d+%d = ?\n", num1, num2);
            ans = num1 + num2;
            break;
        case 1:
            printf("%d-%d = ?\n", num1, num2);
            ans = num1 - num2;
            break;
        case 2:
            printf("%d*%d = ?\n", num1, num2);
            ans = num1 * num2;
            break;
        case 3:
            printf("%d/%d = ?\n", num1, num2);
            ans = num1 / num2;
            break;
        }
    }
    else
    {
        double num1 = (double)(rand()) / RAND_MAX * INT_MAX;
        double num2 = (double)(rand()) / RAND_MAX * INT_MAX;
        random_operation_index = (rand() % 4);
        switch (random_operation_index)
        {
        case 0:
            printf("%lf+%lf = ?\n", num1, num2);
            ans = num1 + num2;
            break;
        case 1:
            printf("%lf-%lf = ?\n", num1, num2);
            ans = num1 - num2;
            break;
        case 2:
            printf("%lf*%lf = ?\n", num1, num2);
            ans = num1 * num2;
            break;
        case 3:
            printf("%lf/%lf = ?\n", num1, num2);
            ans = num1 / num2;
            break;
        }
    }
    return ans;
}

void read(string &grade, int &num_questions)
{
    cout << "Please enter your grade?" << endl;
    cin >> grade >> grade;
    //puts("");
    cout << "Please enter the number of questions?" << endl;
    cin >> num_questions;
}

void solve(string &grade, int &num_questions)
{
    int grade_num = extractGrade(grade);
    int num_correct = 0;
    int ans;
    for (int i = 0; i < num_questions; i++)
    {
        ans = floor(generateEquation(grade_num) * 100.0f + 0.5) / 100.0f;
        int input;
        cin >> input;
        if (ans == input)
        {
            num_correct++;
        }
    }
    if (num_correct == num_questions)
    {
        cout << "end! All right, that's great! Your score is 100." << endl;
    }
    else
    {
        cout << "end! Wrong question, your score is " << (num_correct * 1.0 / num_questions) * 100 << endl;
    }
}

int main()
{
    int num_questions;
    string grade;

    read(grade, num_questions);

    solve(grade, num_questions);

    system("pause");

    return 0;
}